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[目的]研究四川地区水稻纹枯病菌的培养性状及其致病力。[方法]对从四川地区6个水稻主栽点采集的水稻纹枯病样进行分离,将分离所得病菌用马铃薯(PDA)培养基培养,记录其培养性状,并对分离得到的23个菌株进行致病力测定。[结果]不同菌株间的生长速率存在显著差异,23个菌株中只有1个菌株生长速率属于中等菌株(菌落直径:40mm≤Φ≤60mm),其余都为慢型菌株(菌落直径Φ<40mm),无生长速率快的菌株(菌落直径Φ>60mm)。致病力测定结果表明,菌株间致病力存在明显的差异,23个菌株中只有1个为强致病力菌株,其余为中等致病力菌株、无弱致病力菌株。[结论]该研究明确了四川地区水稻纹枯病病菌基本生物学特征,为该地区有效控制水稻纹枯病的危害提供了理论依据。
[Objective] The research aimed to study the cultivation characters and pathogenicity of Rhizoctonia solani in Sichuan. [Method] Rhizoctonia cerealis samples were collected from 6 main rice planting sites in Sichuan Province. The isolated bacteria were cultivated in PDA medium and their traits were recorded. The 23 isolates were isolated Pathogenicity determination. [Results] There were significant differences in the growth rates among different strains. Only one of the 23 strains had a moderate growth rate (colony diameter: 40 mm ≤ Φ ≤ 60 mm) and the rest were all slow strains (colony diameter Φ <40 mm) , No growth rate of fast strains (colony diameter Φ> 60mm). The results of pathogenicity test showed that there was a significant difference in pathogenicity among the isolates. Only one of the 23 isolates was a strong virulent strain and the rest were intermediate virulent strains and no weak virulent strains. [Conclusion] The study identified the basic biological characteristics of rice sheath blight in Sichuan and provided theoretical basis for the effective control of rice sheath blight in this area.